Aircraft



FIG. 1 is a perspective view of an aircraft showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is an elevational view of one side thereof, the elevational view of the other side being substantially a mirror image thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is an elevational view of the rear thereof. 

The ornamental design for an aircraft, substantially as shown and described. 